Open-hearth furnace.



J. C. DVS.

OPEN HARTH FURN/Ci APPLecATmN man MAR. 25. ma,

aten June 2129 193:3.

Acitizen of the United States,

will be present JAMES C. DAVIS, 0F HINSSDALE, ILLINOIS, .ASSIGNOR TO AMERICAN STEEL EOUNDRIES, DE NEW YORK, 1\T. Y., A CORPGRATION OF NEW JERSEY.

4ornn-HEARTH r-URNACE.

'Specification of Letters Patent.

ratenteuaune 2a, i915.

Application filed March 25, 19.14. Serial No. 827,98.

T0 all 107mm it may concern Be is known that I, .lanes C. Davis, a and resident of Hinsdale, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Open-Hearth Furnaces, of which the followingl is a specification. i

My invention relates to open hearth furnaces and has vps irt-icularly reference to a novel end construction as applied to such furnaces.

l lt is a well known fact that in ordinaryopen hearth furnaces the gases of combustion attain their maximum temperature at the end of the furnace opposite 'that from ywhich they enter and this point of maXi` mum temperature 'is usually at or near the end ofthe bath of metal and in close proximity to the end walls ofthe furnace, which walls serve to deflect the gases downwardly into the slag pockets leadingto the regenerative chamber. These end walls tend to burn out much more quickly than other portions of the furnace wall for the obvious reason that they are subjected to the highest temperature and to the force of the gases when deflected from their normal path as is necessai-y.

I have conceived the idea that if the exhaust gases are allowed to expand immediately after leaving the furnace, the velocity of the gases will he reduced in proportion to the changein volume due to expansion and that while the saine number of heat units in the exhaust gases, this heat will be less intense and by reason of the reduced velocity due to the increased volume will be radiated more readily without destruction of the furnace walls.

My invention may therefore be said to consist in an open hearth furnace so con struct-ed as to permit an expansion of the exhaust gases immediately after leaving the hearth.

The invention will be more readily understood by reference to the accompanying drawings, wherein,

Figure l is a horizontal section through a portion of an Open hearth furnace 'showing my novel end construction; Fig. 2 is a section on the line 2-2 of Fig. l, and,I Fig. 3

is a section on the line 5;)1-3 of F ig. l.

Referring more particularly to the drawthan the, furnace.

lend thereof.-

ings it will be seen that I provide the usual open hearth furnace 10, having an end wall ll, of considerable greater transverse width This end wall ll is connected to the furnace walls by the diagonal walls 12. Mounted within the end construction are air fines 13, and gas flu'es H. Bv

thus providing a widened end l am enabled to construct flues of much greater total relative volume than is customary. Thus it will be seen that as the 'hot gases pass from the `hearth they are at once permittedto expand into a spaceof increasing-capacity and that therefore their velocity is decreased in proportion tothe increase 1in volume. Such gases being therefore of a greater volume and decreased velocity will transmit less of their heat to the surrounding walls and such walls being of greater area will absorb such heat with less damage to' themselves.

It will be noted that the side walls of the furnace are parallel, and it will be understood that the cross sectionallarea ofthe furnace is substantially constant from end to Of course, there ma)7 be some variation from time to time, dueto changes in the' hearth. The present invention contemplates thje addition to a furnace of thisV description of flaring walls at both ends. whereby the gases,expand into an enlarged space.

The construction shown in the drawings is only 'typical of different forms in which the invention may wish therefore to herein shown -I claim:

l. In combination, a furnace of substantially uniform cross sectional area from end to end thereof, said furnace having flaring end walls. thereby?providing fines having a cross sectional area greater than that of the furnace` substantially as described.

2. In combination, a furnace having' straight, substantially parallel inside lwalls and outwardly flaring end walls, thereby providing flues of greater cross sectional area than the cross sectional area of the furand described.

nace at thepoint of discharge into said flues,

be exemplified. I do not" be limited to the form` 

